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Beat the heat: How mulch can save your garden

Layer of wood chips, straw or leaves helps plants cope with summer temperatures

Wood chip mulch helps these plants' roots stay cool, controls weeds, and improves the soil, too.

Wood chip mulch helps these plants' roots stay cool, controls weeds, and improves the soil, too. Courtesy

As temperatures rise this month, gardeners can do one thing that will make a huge difference for their plants (and their pocketbooks): Mulch.

It’s amazing what a layer of leaves, chips or straw can do.

Following nature’s lead, mulch can insulate plant roots from heat and cold, cut down on weeds, feed the soil – and save lots of water, time and money.

In summer, a layer of organic mulch – wood chips, straw, dried leaves or similar material – can add up to major water savings. Local water managers estimate that 2 to 3 inches of mulch can save 30 gallons of water per 1,000 square feet every time irrigation is turned on.

Landscape experts know that mulch is key to helping plants not only survive but thrive during Sacramento summers.

“Mulch is the essence of garden life, the foundation for your garden,” says Greg Gayton, garden guru for Green Acres Nursery & Supply. “Mulch suppresses weeds – which cuts down on work. It cools the roots of plants and maintains moisture so plants can get through the summer time. And it helps soil biology; that makes for healthier plants.”

Mulch is particularly important during summer months, he notes. “In summer, no mulch is a big problem. Mulch retains moisture. Without it, your garden dries out quickly, plants are stressed. With mulch, you don’t water as often and your plants are much happier.”

How much mulch does your garden need? For best results, apply wood chips in a 2- to 3-inch layer. One 2-cubic foot bag covers 8 to 12 square feet. One cubic yard covers 162 square feet 2 inches deep or 108 square feet 3 inches deep.

Don’t mound mulch around trunks. Make sure to clear a space at least 4 to 6 inches away around trees or shrubs. Otherwise, those plants retain too much moisture at their base; that can lead to crown rot.

In his own garden, Gayton uses lots of organic mulch including soil amendments such as worm castings or aged chicken or steer manures.

“I always mulch twice a year,” he says. “I like to put down manures. I’m always adding things to the soil. I don’t incorporate it (dig it in); I just lay it on top.”

Then, the nutrients can trickle down into the soil while the blanket of mulch smothers weeds. When these amendments are dug into the soil, that can bring fresh weed seeds to the surface to sprout.

“I prefer organic mulches because they add to the soil,” Gayton explains. “It’s really important to build up nice soil biology.”

That biology is based on microbes – the microscopic organisms that break down nutrients in soil. Without microbes, plant roots can’t access those natural nutrients. Microbes really appreciate that mulch blanket; while feeding them, mulch helps keep their environment comfortable, too.

Mulch also is a major time saver for gardeners, Gayton adds.

“Mulch is instrumental in keeping weeds controlled,” he says. “It even works against Bermuda grass and bindweed. I keep putting mulch on top and plants thrive.”

Mulch also can give a finished look to a landscape. An even layer of wood chips can unify planting beds.

Commercial bark – which is usually cedar or redwood – is available in different colors such as black or red. The bark is treated and dyed with biodegradable coloring that’s safe for people, plants and pets. According to manufacturers, iron oxide is used to color bark red; black bark is dyed with carbon black.

Gayton prefers plain wood chips to dyed. “I prefer a natural look – I’m a purist,” he says. “Bark is always good natural looking. I prefer the small pieces; they break down faster.”

Gorilla hair – shredded cedar bark – is another popular choice, but use with caution. “Gorilla hair is great – if you don’t live in a high fire-danger area,” Gayton notes. “It keeps the ground cool, but it can catch fire easily. Don’t use it in the foothills, but it’s definitely OK in the city.”

Gayton is not a fan of landscape rocks as mulch. They may look cool in a landscape, he notes, but tend to absorb heat and stress plant roots. Some landscapers like decomposed granite, gravel or rocks around shrubs and trees because they’re easy to blow off leaves. But the rocks aren’t adding nutrients to the soil.

However, rock doesn’t burn. In high fire-danger areas, decomposed granite or gravel is a must to help create defensible space. The California Department of Forestry and Fire Protection recommends surrounding structures with a 5-foot-wide buffer of hardscape, gravel or rock, as well as using gravel as a fire buffer in the landscape.

It’s a barrier to fire and serves a purpose,” Gayton says. “It looks nice and neat, but I tend to use organic mulch and use rock sparingly.”


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Garden Checklist for week of June 16

Summer officially starts Thursday. The good news: No triple-digits – at least until next weekend.

* Warm weather brings rapid growth in the vegetable garden, with tomatoes and squash enjoying the heat. Deep-water, then feed with a balanced fertilizer. Bone meal or rock phosphate can spur the bloom cycle and help set fruit.

* Generally, tomatoes need deep watering two to three times a week, but don't let them dry out completely. That can encourage blossom-end rot.

* Tie up vines and stake tall plants such as gladiolus and lilies. That gives their heavy flowers some support.

* Dig and divide crowded bulbs after the tops have died down.

* Feed summer flowers with a slow-release fertilizer.

* Mulch, mulch, mulch! This “blanket” keeps moisture in the soil longer and helps your plants cope during hot weather.

* Thin grapes on the vine for bigger, better clusters later this summer.

* Trim off dead flowers from rose bushes to keep them blooming through the summer. Roses also benefit from deep watering and feeding now. A top dressing of aged compost will keep them happy. It feeds as well as keeps roots moist.

* Pinch back chrysanthemums for bushier plants with many more flowers in September.

* From seed, plant corn, pumpkins, melons, radishes, squash and sunflowers.

* Plant basil to go with your tomatoes.

* Transplant summer annuals such as petunias, marigolds and zinnias.

* It’s also a good time to transplant perennial flowers including astilbe, columbine, coneflowers, coreopsis, dahlias, rudbeckia, salvia and verbena.

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